Timer



TIMER Filed Nov. 5. 1926 2 Sheets-Sheet 1 9 You CHar/es H. Parker (Tame.

May 8, 1928. 1,668,780

c. A. PARKER TIMER 2 Sheets-Sheet Filed Nov. 5. 1926 9mm C/Iar/es H. Parke/ KJM @mmm

Patented May 8, 1928.

UNITED STATES PATENT OFFICE.

CHARLESA. PARKER, OF HAUGAN, MONTANA, ASSIGNOR OF ONE-HALF TO GEORGE R. WELLS, OF DEBORGIA, MONTANA.

TIMER.

Application filed November My present invention relates to improvements in timers of the commutator type for ignition systems of internal combustion engines, in which a rotor or brush-holder is revolved at a predetermined speed ratio from the engine shaft, with relation to a stator, for causing successive makes and breaks in proper order of electrical circuits controlling the ignition devices.

The primary object of the invention is the provision of a compactly arranged device that is comparatively inexpensive in cost of production, simple in construction and operation' and highly etiicient in the performance of its functions of distributing the electrical currents as required.

By the utilization of the device of my invention, a maximum friction surface is provided between the moving and stationary contact members; uniformity in wear on the operating parts is insured; a reliable and close frictional contact is maintained, and compensation is made for wear of parts, thus prolonging the durability of the timer.

The invention consists in certain novel features of construction involving the rotor and stator, and combinations and arrangements of elements embodied inthese parts as will be specifically pointed out and claimed.

In the accompanying drawings I have illustrated a single brush-holder and a duplex brush-holder in two complete examples of the physical embodiment of my invention wherein the parts are combined and arranged according to the best modes I have thus far devised for the practical application of the principles of my invention.

lVhile I have shown the invention as adapted for use in connection with a fourcylinder engine. it will be apparent that the timer may readily be converted for use in connection with other types of engines without departing from the spirit of my invention.

Fig. 1 is a sectional view of the timer enibodying a duplex lnush-holder.

Figure 2 is a transverse sectional view at line 22 of Figure 1.

Figure 3 is a reduced exterior side view of the timer.

Figure 4 is an enlarged sectional view of the timer with the parts separated.

Figure 5 is enlarged perspective view 5, 1926. Serial No. 146,326.

of a portion of the timer showing the insulating ring, a stationary contact member thereon, and one of the terminal lugs.

Figure 6 is a face view of one of the ln'ush-holders.

Figure T is a sectional view of the timer, using a single brush-holder.

Figure 8 is a transverse sectional view of Figure 7.

l gurc 9 is a perspective view of the brush-holder.

Figure 10 is a sectional view showing the parts of the timer separated.

Figure 11 is a perspective detail view showing one of the stationary contact memhers and its connections.

In carrying out my invention I utilize the rotary shaft 1 which may be a crank shaft of an internal combustion engine, and the shaft is supported in suitable bearings and in a portion of the crank case 2. As shown in the drawings, the shaft projects through the crank case wall and the end of the shaft in Figure 1 is provided with a pair of hubs 3 and 4 forming part of the duplex brushholders or rotor of the timer. These hubs are carried by the shaft and they are locked together with a clutch device indicated as 3 and 4 in Figure 1, and a locking nut 5 on the end of the shaft provides a rigid structure for rotation with the shaft 1.

Each of these hubs is provided with a crank arm, as 6 and 7, and each of these arms at its outer end, supports a rectangular spring frame as 6 and 7. These rectangular frames straddle the hubs on the shaft, and form the holders for the triangular shaped brush heads 8 secured at the free onus of the frames. In Figure 1 it will be seen that the crank arms 6 and 7 are parallel. with each other, and the resilient rectangular frames 6' and T are aligned and arrai ged in complementary manner. As best seen in Figure 6 the brush heads 8 are riveted to the free ends of these resilient holders. The brush heads which are preferably made of copper or phosphor bronze are fashioned in a wedge-shape or of triangular shape in order that their side edges may make an easy and smooth contact with the stationary contact members as the brushes rotate with their holders.

The duplex brush-holders rotate or revolve in a housing which may be made up Within the housing are contained the Std? tionary contact members 12, here shown as our in number. These contactniembersare made up in U-shapes, and each contact member has an integralperforated terminal lug 13 tor the lead Wires indicated as 14L and 15 in F i re 1. The stationary contact members are secured to anon-conducting ring 16, which is made up of fiber or other insulating material; The insulating ring 16 is grooved and counter-sunk to acconnnodate the U-shaped' contact niembers, and it will be apparent that these stationary contact members on opposite sides of the insulating ring are adapted for use with the duplex brush heads 8*which are adapted to revolve in planes at opposite sides of the insulating'ring. *The insulating ring is secured in the housing by means of the lugs 13 which proj'ectf' outwardly through complementary notches 17 in the circular edge of the cap 10, and in this manner the stator, r insulatring and its stationary contact members, is'heid against movement.

InFigure 7 the cap or housing 18 is socured to the crank case 2 in suitable manner, and 'a single brush-holder is" enclosed within the hous'ing. This 'brusl'i-holder or rotoi' comprises the sleet e which is secured on the shattl by means of the nut 5, and the radial nurse, to which the resilient rectangular frame 21' is secured. This frame straddles the hub 19, and carries the brush head 22. 'Tliestato'r is made up of an insulatin ring'22 fashioned of fiber or' other sitabl'ematerial, and is'provided with tour stationary 'cbntact p oint sfor members 23.

th l

These members or contacts 23 are arranged On one side only of the insulating ring, and the contacts are fashioned with end flanges 2% to engage the opposite sides or edge-s oi At 25 the insulating ring is protli notches 61 the frec eption of a vide d ilio lt head, and the terminalscrews 27 exitend through the housing 18 trom these bolt heads. The lead wires 28 are secured to these terminals by the usual nut-s 29.

In Figure 10 the resiliency of the brushholder will be illustrated, and it will be apparent that when the housing is slipped over the end of the shaft as-indicated by dotte'dvlines, he resilient frame 21 will be placed under tension to hold the brush frictional contact with the stator. Thu-s, as the rotor revolves with the shaft the brush 22' is caused to make successive make and break contact with the stationary members or contacts 23 of the insulating ring 22.

Having thus fully described my invention what I claim new and desire to secure by Letters Patent is:

' 1; In a timer. the combination with a stator comprising an insulating ring-having complementary Ushaped contacts, of apair of opposed resilient open frames. forming holders andbrushes on said-holders, a rotary shaft, a pair of hubs on said shatt and a rigid connection therebetween, anda supporting arm on eachhub for said holders.

2.111 a timer the combination with a stator comprising an insulating ring having complementary U-shaped contacts,'ot a pair of opposed resilient open frames forming holders and brushes on said holders, arotary' shaft having-a threaded end, a pair of hubs on said shaft complementary clutches tongues and notches, asupporting arm on each hub for said holders, and a lock nut on theshatt.

i testimony whereof I-aliix my CHARLES-A. manna.

signature. 

